Prayoto Prayoto Gadjah Mada University, Graduate Program Yogyakarta 55281, Indonesia Indonesia
S. M. Prasetyo Research and Development Centre for Materials Science and Technology - BATAN Kawasan Puspiptek, Serpong 15314, Tangerang Indonesia
H. Eckerlebe GKSS Research Centre, Max Planck-Str 21502 Geesthacht, Germany Germany
A. Djaloeis Nuclear Energy Control Board of Indonesia Jakarta 10530, Indonesia Indonesia
R. Wagner Jülich Research Centre 52425 Jülich, Germany Germany